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1 .This is Scientific American's 60-Second Space. I'm John Matson. Got a minute?
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2 .Weighing the Milky Way is no easy task.
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3 .It's not like you can just step outside the galaxy and place it on a humongous scale.
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4 .Plus, most of the galaxy's heft is in invisible dark matter, which betrays its presence only through its gravitational pull.
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5 .So astronomers have devised clever ways of inferring the mass of our galaxy by measuring how it pulls on smaller objects moving around it.
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6 .A new estimate, based on its effect on the motion of a nearby dwarf galaxy, has the Milky Way a bit beefier than some past measurements that relied on the motions of massive stars.
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7 .The study is in the Astrophysical Journal.
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8 .The researchers first used the Hubble Space Telescope to track the dwarf galaxy Leo I,
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9 .which at 850,000 light-years away is one of the most distant of the satellite galaxies swarming around the Milky Way.
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10 .Then they simulated galaxies able to host such an object.
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11 .Turns out that anything less massive than one trillion suns is very unlikely.
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12 .In fact, the researchers estimate that the Milky Way's dark matter has as much mass as 1.6 trillion suns.
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13 .That's some pretty heavy-duty astrophysics.
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14 .Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.
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